[issue31975] Add a default filter for DeprecationWarning in __main__

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

(And yes, I could push this as a downstream patch to Fedora's Python packages instead - if enough folks insist that springing breaking changes on people without warning them that those changes coming is fine, that's what I'll do)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31975>
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